<template>
	<view>
		<!-- 自定义搜索组件 -->
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧滚动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滚动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMin from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMin],
		data() {
			return {
				// 当前设备可用高度
				wh: 0,
				// 分类列表数据
				cateList: [],
				active: 0,//动态绑定类名
				cateLevel2: [],//二级分类
				scrollTop: 0,//滚动条重置
			};
		},
		onLoad() {
			const systemInfo = uni.getSystemInfoSync()
			// console.log('systemInfo',systemInfo);
			this.wh = systemInfo.windowHeight - 50
			
			this.getCateList()
			
			
		},
		methods:{
			async getCateList(){
				const {data:res}=await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				
				this.cateList = res.message
				
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i){
				this.active = i
				
				// 重新给二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				
				// 重置滚动条
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item){
				// 跳转到商品列表页面
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	
	.left-scroll-view {
		width: 120px;
		
		.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active {
				background-color: #FFFFFF;
				position: relative;
				
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 40px;
					background-color: #2b9939;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
}

.cate-lv2-title {
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}

.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	
	.cate-lv3-item {
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		width: 33.33%;
		flex-wrap: wrap;
		margin-bottom: 10px;
		
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px
		}
	}
}


</style>
